Sorry for resurrecting an old thread, but this one seems richest in info about Sahti.
Just brewed my first Sahti yesterday, currently bubbling away...
I'm from Lithuania (also in Northern Europe) and we have very similar farmhouse brewing traditions (the Kuurna, hot stone mashing, no boiling, Hiiva yeast, etc.). However we're not really used to using juniper... I did it this way:
1. Doughed-in with hot water (no Juniper branches).
2. Mashed for 90 minutes.
3. Transfered the mash onto mash-tun lined with juniper branches.
4. Heated the sparge water with additional juniper branches and used it to lauter.
5. I know this is not traditional, but I boiled the wort for 30 minutes, because I'm planning to bottle my Sahti. I also added crushed dried juniper berries in the last 3 minutes of the boil.
I'm not used to making Sahti, so I wanted to clarify a few things from fellow Finns or someone with Sahti making experience:
1. Should you be able to taste the juniper immediately in the lautered wort or only after the fermentation (because I couldn't really detect the juniper in the wort..)
2. Should you dough-in with juniper water, or only the sparge water should be heated with juniper branches?
3. How long should you keep/boil the juniper branches in the sparge water before it's ready?
4. Do you think juniper branches/berries might be a good idea in the secondary? (like dry hopping).
Thanks for the answers!
* By the way, I noticed the thread's author used the wrong kind of juniper (looks more like Thuja), the traditional Northern Europe juniper looks like this (needles almost like spruce):